VENTSHIELD | Attenuation Vents Our VH Shielding range of lightweight aluminium ... ·...

SERIES FRAME STYLE VENT MEDIA OVERALL SIZE FIXINGS (NO.) FIXING TYPEVH-Vent AF1 01=Cross-pole xxxx-xxxx xx C/T=Captive insertAluminium AF2 02=Single layer T/H=Through hole AF3 03=Slant 45O AF4 04=Slant cross-pole AF5 AF6 AF7 AF8 AF9

How to order: Specify: Series - Frame Style - Vent Media - Overall Size - Number of Fixings - Fixing Type/Size

Where possible please provide a detailed drawing.

Example:VH-AF1-01-2260-4330-12-T/H (4.8) speci�es an aluminium cross-polarised vent panel in AF1 frame style with 12 through holes of 4.8 mm diameter. Hole positions to be agreed with the customer prior to manufacture or as shown on the customer drawing.

For aluminium vent panel types and styles not shown please contact us or forward a detailed drawing for quotation.

Tolerances: Overall dimensions ± 0.8mm Fixing holes/fasteners ± 0.5mm with jigs +/- 0.2mm

Dust filtration Demountable dust �lters are available for use with attenuation vents and are featured in the VB Shielding section. They are generally produced using the AF1 or AF5 frame style and can be mounted with quick-release fasteners for ease of cleaning or replacement.

VH AF1

15

VENTSHIELD | Attenuation VentsVH Shielding

VH AF2

VH AF3 VH AF4

VH AF5VH AF6

VH AF7 VH AF8

VH AF9

VENTSHIELD | Attenuation Vents VH Shielding

14

Applications: Lightweight aluminium honeycomb vents can be mounted onto most forms of shielded enclosure where air�ow is needed, either over cooling fans or by convection. They can be mounted anywhere on the enclosure and can be �tted with protective ‘kick-plates’ to protect the honeycomb material from accidental damage.

Where they may be exposed to the elements the vents can be �tted with ‘slant’ honeycomb which provides a downward facing aperture, preventing the ingress of rainwater. This has the added bene�ts of directional air�ow and increased attenuation due to the higher aspect-ratio of the cell structure.

Honeycomb ventilation panels are usually supplied with gaskets in a ready-to-mount form which either �ts around the aperture in the equipment (non-�anged style) or to be inset into the enclosure (�anged style). Depending on the performance requirements for the application, they can be mounted by bolting through clearance holes in the frame or through the use of captive threaded inserts.

Aluminium honeycomb material is formed by expanding a bonded aluminium foil into a honeycomb structure. This process, which is common to all honeycomb manufacturers, produces a material which is ‘polarised’ and is conductive either horizontally or vertically. To overcome polarisation problems two layers of honeycomb, mounted at 90 degrees to each other, are used. Please contact us for further information about polarisation.

Each cell in an attenuation vent acts as a waveguide and its performance is a function of its width/height and the ratio between the depth and width of the cell. Generally an aspect ratio of 4:1 or 5:1 is used.

Aluminium honeycomb vents are �nished to suit speci�c applications and can be protected by Alocrom 1000, 1200 or electroplating. We can also o�er an Iridite conversion which is RoHS compliant.

Specifications: For gasket material speci�cations please refer to knitted mesh gaskets (pages 4-13), oriented wires in silicone gaskets (pages 20-22) and conductive silicone gaskets (pages 39-42).

Performance: Typical Attenuation dB FREQUENCY FIELD ATTENUATION10 KHz H 45100 KHz H 491 MHz H 511 MHz E >10010 MHz E >100100 MHz E >1001 GHz P 9810 GHz P 95

Our VH Shielding range of lightweight aluminium honeycomb attenuating ventilation panels comprise of forms of conductive airflow media retained within an aluminium extrusion. They are designed for use in racks and other forms of commercial enclosure.

TECHNOLOGY

P & P Technology Ltd1-3 Finch DriveSpringwood Industrial EstateBraintree CM7 2SF

T: +44 (0)1376 550525W: www.p-p-t.co.ukE: [email protected]

P & P Technology Ltd Unit 5 Cherry TreeWethersfield RoadHalstead, Essex CO9 3LZ

T: +44 (0) 1376 550 525W: www.p-p-t.co.ukE: [email protected]

SERIES FRAME STYLE VENT MEDIA OVERALL SIZE FIXINGS (NO.) FIXING TYPEVH-Vent AF1 01=Cross-pole xxxx-xxxx xx C/T=Captive insertAluminium AF2 02=Single layer T/H=Through hole AF3 03=Slant 45O AF4 04=Slant cross-pole AF5 AF6 AF7 AF8 AF9



Example:VH-AF1-01-2260-4330-12-T/H (4.8) speci�es an aluminium cross-polarised vent panel in AF1 frame style with 12 through holes of 4.8 mm diameter. Hole positions to be agreed with the customer prior to manufacture or as shown on the customer drawing.

For aluminium vent panel types and styles not shown please contact us or forward a detailed drawing for quotation.

Tolerances: Overall dimensions ± 0.8mm Fixing holes/fasteners ± 0.5mm with jigs +/- 0.2mm

Dust filtration Demountable dust �lters are available for use with attenuation vents and are featured in the VB Shielding section. They are generally produced using the AF1 or AF5 frame style and can be mounted with quick-release fasteners for ease of cleaning or replacement.

VH AF1

15

VENTSHIELD | Attenuation VentsVH Shielding

VH AF2

VH AF3 VH AF4

VH AF5VH AF6

VH AF7 VH AF8

VH AF9

VENTSHIELD | Attenuation Vents VH Shielding

14

Applications: Lightweight aluminium honeycomb vents can be mounted onto most forms of shielded enclosure where air�ow is needed, either over cooling fans or by convection. They can be mounted anywhere on the enclosure and can be �tted with protective ‘kick-plates’ to protect the honeycomb material from accidental damage.

Where they may be exposed to the elements the vents can be �tted with ‘slant’ honeycomb which provides a downward facing aperture, preventing the ingress of rainwater. This has the added bene�ts of directional air�ow and increased attenuation due to the higher aspect-ratio of the cell structure.

Honeycomb ventilation panels are usually supplied with gaskets in a ready-to-mount form which either �ts around the aperture in the equipment (non-�anged style) or to be inset into the enclosure (�anged style). Depending on the performance requirements for the application, they can be mounted by bolting through clearance holes in the frame or through the use of captive threaded inserts.

Aluminium honeycomb material is formed by expanding a bonded aluminium foil into a honeycomb structure. This process, which is common to all honeycomb manufacturers, produces a material which is ‘polarised’ and is conductive either horizontally or vertically. To overcome polarisation problems two layers of honeycomb, mounted at 90 degrees to each other, are used. Please contact us for further information about polarisation.

Each cell in an attenuation vent acts as a waveguide and its performance is a function of its width/height and the ratio between the depth and width of the cell. Generally an aspect ratio of 4:1 or 5:1 is used.

Aluminium honeycomb vents are �nished to suit speci�c applications and can be protected by Alocrom 1000, 1200 or electroplating. We can also o�er an Iridite conversion which is RoHS compliant.


Performance: Typical Attenuation dB FREQUENCY FIELD ATTENUATION10 KHz H 45100 KHz H 491 MHz H 511 MHz E >10010 MHz E >100100 MHz E >1001 GHz P 9810 GHz P 95

Our VH Shielding range of lightweight aluminium honeycomb attenuating ventilation panels comprise of forms of conductive airflow media retained within an aluminium extrusion. They are designed for use in racks and other forms of commercial enclosure.

TECHNOLOGY

P & P Technology Ltd1-3 Finch Drive

Springwood Industrial EstateBraintree CM7 2SF


P & P Technology Ltd Unit 5 Cherry TreeWethersfield Road

Halstead, Essex CO9 3LZ


VENTSHIELD | Air Filter with Dustshield VF Shielding

SERIES FRAME STYLE VENT MEDIA OVERALL SIZE FIXINGS (NO.) FIXING TYPEVF-Dust Filter AF1 08=Triple mesh xxxx-xxxx xx C/T=Captive insertAluminium AF2 T/H=Through hole AF3 AF4 AF6 AF7 AF8

Applications: Aluminium mesh dust �lters are mounted in the same manner as the VH Shielding and are used in industrial or military environments where a 'heavy duty' attenuating dust �lter is required and a lighter weight de-membraned polyurethane VB Shielding is not suitable. They are not designed for pure convection and need a driven air�ow. They may be solvent cleaned after removal but particular attention should be paid to the replacement of gaskets which could be a�ected by compression-set or hydrocarbon/solvent contamination.

Specifications: Woven Aluminium Screen AMS-4182

Performance: Typical dB (based on a 250mm2 test section)FREQUENCY FIELD ATTENUATION10KHz H 42100KHz H 531MHz H 611MHz E 9210MHz E 81100MHz E 601GHz P 5210GHz P 43

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How to order:

Specify: Series - Frame Style - Vent Media - Overall Size - Number of Fixings - Fixing Type/Size


Example: VF-AF1-08-2260-4330-12-T/H (4.8) speci�es a corrugated three layer aluminium woven mesh dust-�lter in an AF1 style frame with 12 through holes of 4.8 mm diameter. The hole positions would be agreed with the customer prior to manufacture or as shown on the customer drawing.

Our VF Shielding combines the benefits of an attenuation vent panel with the properties of a dust filter in a single frame, unlike VB Shielding which utilises separate units fixed together in-situ.

Standard frame styles are AF1, AF2, AF3, AF4, AF6, AF7 and AF8 and they incorporate a triple layer of woven and corrugated aluminium mesh. Each layer has a slightly different degree of corrugation and so provides separation and increased airflow potential. To enable it to perform its dual function the VF filter material is relatively dense and so requires an assisted airflow to operate correctly. A ‘kick plate’ is built into the unit to protect the filter from damage.

Tolerances: Overall dimensions ±0.8mm Fixing holes/fasteners ±0.5mm with jigs ±0.2mm

VF AF2

VF AF4

VENTSHIELD | Vent/Filter Composites VB Shielding

Applications: Honeycomb vent & demembraned polyurethane dust �lter panels are usually used inside racks and electronic equipment enclosures, in particular where the ingress of dust or foreign matter is likely but the heavier duty woven aluminium mesh is not needed. Filters �tted inside the equipment can have quick-release fastenings and do not require a shielded gasket. In applications where the attenuation vent is �xed directly to the enclosure, dust �lters mounted outside the equipment do not need a shielded gasket.


Our VB Shielding vent/filter assemblies are composites of the VH Shielding honeycomb attenuation vents and demountable dust filter panels containing demembraned polyurethane filter media. The vent is specified in the normal way and contains, within its mounting frame, additional fixings (usually captive threaded inserts) which are used to retain the framed dust filter element.

The dust filter can be mounted either side of the vent panel and attention should be paid when specifying the type of interface gasket to ensure that, where necessary, it is conductive. The filter material is available with openings of 30 to 60 pores per inch as standard, but others can be specified, and is secured by a woven mesh kick plate.

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SERIES FRAME STYLE VENT MEDIA OVERALL SIZE FIXINGS (NO.) FIXING TYPEVB=Composite AF1 09= xxxx-xxxx xx As Speci�ed AF2 Demembraned AF5 Polyurethane

How to order:



Example:VH-AF1-01-2260-4330-12-T/H (4.8) plus VB-AF1-09-6 speci�es an AF1 style honeycomb vent �tted with an AF1 dust-�lter using 6 fasteners. It would be normal in such instances for the assembly to be detailed in drawing form indicating the precise mounting method and sequence in relation to the enclosure.

Performance: Typical dB FREQUENCY FIELD ATTENUATION10 KHz H 45100 KHz H 491 MHz H 511 MHz E >10010 MHz E >100100 MHz E >1001 GHz P 9810 GHz P 95


VB AF1DUSTFILTER

AF1HONEYCOMBVENT

AF1HONEYCOMBVENT

VB AF1DUSTFILTER

TECHNOLOGY





VENTSHIELD | Air Filter with Dustshield VF Shielding

SERIES FRAME STYLE VENT MEDIA OVERALL SIZE FIXINGS (NO.) FIXING TYPEVF-Dust Filter AF1 08=Triple mesh xxxx-xxxx xx C/T=Captive insertAluminium AF2 T/H=Through hole AF3 AF4 AF6 AF7 AF8

Applications: Aluminium mesh dust �lters are mounted in the same manner as the VH Shielding and are used in industrial or military environments where a 'heavy duty' attenuating dust �lter is required and a lighter weight de-membraned polyurethane VB Shielding is not suitable. They are not designed for pure convection and need a driven air�ow. They may be solvent cleaned after removal but particular attention should be paid to the replacement of gaskets which could be a�ected by compression-set or hydrocarbon/solvent contamination.

Specifications: Woven Aluminium Screen AMS-4182

Performance: Typical dB (based on a 250mm2 test section)FREQUENCY FIELD ATTENUATION10KHz H 42100KHz H 531MHz H 611MHz E 9210MHz E 81100MHz E 601GHz P 5210GHz P 43

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How to order:



Example: VF-AF1-08-2260-4330-12-T/H (4.8) speci�es a corrugated three layer aluminium woven mesh dust-�lter in an AF1 style frame with 12 through holes of 4.8 mm diameter. The hole positions would be agreed with the customer prior to manufacture or as shown on the customer drawing.

Our VF Shielding combines the benefits of an attenuation vent panel with the properties of a dust filter in a single frame, unlike VB Shielding which utilises separate units fixed together in-situ.

Standard frame styles are AF1, AF2, AF3, AF4, AF6, AF7 and AF8 and they incorporate a triple layer of woven and corrugated aluminium mesh. Each layer has a slightly different degree of corrugation and so provides separation and increased airflow potential. To enable it to perform its dual function the VF filter material is relatively dense and so requires an assisted airflow to operate correctly. A ‘kick plate’ is built into the unit to protect the filter from damage.


VF AF2

VF AF4

VENTSHIELD | Vent/Filter Composites VB Shielding

Applications: Honeycomb vent & demembraned polyurethane dust �lter panels are usually used inside racks and electronic equipment enclosures, in particular where the ingress of dust or foreign matter is likely but the heavier duty woven aluminium mesh is not needed. Filters �tted inside the equipment can have quick-release fastenings and do not require a shielded gasket. In applications where the attenuation vent is �xed directly to the enclosure, dust �lters mounted outside the equipment do not need a shielded gasket.


Our VB Shielding vent/filter assemblies are composites of the VH Shielding honeycomb attenuation vents and demountable dust filter panels containing demembraned polyurethane filter media. The vent is specified in the normal way and contains, within its mounting frame, additional fixings (usually captive threaded inserts) which are used to retain the framed dust filter element.

The dust filter can be mounted either side of the vent panel and attention should be paid when specifying the type of interface gasket to ensure that, where necessary, it is conductive. The filter material is available with openings of 30 to 60 pores per inch as standard, but others can be specified, and is secured by a woven mesh kick plate.

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SERIES FRAME STYLE VENT MEDIA OVERALL SIZE FIXINGS (NO.) FIXING TYPEVB=Composite AF1 09= xxxx-xxxx xx As Speci�ed AF2 Demembraned AF5 Polyurethane

How to order:



Example:VH-AF1-01-2260-4330-12-T/H (4.8) plus VB-AF1-09-6 speci�es an AF1 style honeycomb vent �tted with an AF1 dust-�lter using 6 fasteners. It would be normal in such instances for the assembly to be detailed in drawing form indicating the precise mounting method and sequence in relation to the enclosure.

Performance: Typical dB FREQUENCY FIELD ATTENUATION10 KHz H 45100 KHz H 491 MHz H 511 MHz E >10010 MHz E >100100 MHz E >1001 GHz P 9810 GHz P 95


VB AF1DUSTFILTER

AF1HONEYCOMBVENT

AF1HONEYCOMBVENT

VB AF1DUSTFILTER

TECHNOLOGY







VENTSHIELD | Thin Attenuation Vent Panels

VT Shielding

Applications: Thin vent panels are designed for enclosures or racks where RF attenuation and protection from the ingress of foreign bodies is required but space is at a premium.

Expanded aluminium mesh panels are nominally 6.0mm thick inside a 4.8mm thick frame and provide attenuation levels considerably higher than the woven aluminium & expanded Monel foil types which have a very small e�ect on air�ow but o�er less shielding e�ectiveness.

All three shielding materials have very di�erent properties and their air�ow characteristics are a function of size, positioning, application and air�ow source / volume. We suggest that a sample of the materials is requested for customer testing before speci�cations are �nalised - please ask our sales o�ce.Performance: Typical Attenuation dB

FREQUENCY FIELD BRASS BRASS BRASS STEEL STEEL STEEL S/STEEL S/STEEL S/STEEL 3.2mm Cell 3.2mm Cell 4.8mm Cell 3.2mm Cell 3.2mm Cell 4.8mm Cell 3.2mm Cell 3.2mm Cell 4.8mm Cell 12.7mm Thick 25.4mm Thick 25.4mm Thick 12.7mm Thick 25.4mm Thick 25.4mm Thick 12.7mm Thick 25.4mm Thick 12.7mm Thick

1 KHz H 13 25 20 16 30 29 16 30 2910 KHz H 38 80 70 50 85 72 50 85 72100 KHz H 80 100 95 90 118 108 90 118 1081 MHz H 105 110 110 110 118 115 110 118 11510 MHz H 105 110 110 110 118 115 110 118 1151 KHz E 110 110 110 110 111 111 110 111 11110 KHz E 115 115 115 115 115 115 115 115 115100 KHz E 115 120 120 115 120 120 115 115 1201 MHz E 115 120 120 115 120 120 115 115 12010 MHz E 115 120 120 115 120 120 115 115 120100 MHz P 115 130 130 115 130 130 115 115 130400 MHz P 115 130 130 115 130 130 115 115 1301 GHz P 105 120 120 105 120 120 105 105 12010 GHz P 105 120 120 105 120 120 105 105 120

Note: Performance will be a�ected by the type of mounting used. Figures based on 300mm x 300mm test pieces.

Our VT Shielding thin vent panels can be custom manufactured from expanded aluminium, woven aluminium or expanded Monel. When selecting the material, airflow should be considered along with the attenuation requirements.

VT thin vent panels are effectively slimmer versions of the VF air filters but with different filtration media. The VT Shielding comprises two basic types referred to as A & B.

VT(A) panels incorporate an expanded aluminium mesh which is crimped into an aluminium extrusion frame. The VT(A) style offers excellent dust filtration and RF shielding performance but considerably restricted airflow.

VT(B) vents incorporate either a woven aluminium or expanded Monel foil crimped into an aluminium extrusion.

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SERIES FRAME STYLE VENT MEDIA OVERALL SIZE FIXINGS (NO.) FIXING TYPEVT(A) TV1 or 05=Expanded Aluminium xxxx-xxxx xx xx TV2 06=Woven Aluminium VT(B) TV3 07=Expanded Monel



Example:VT(A)-TV2-05-2320-2320-12-T/H(M4) speci�es a thin vent utilising expanded and crimped aluminium alloy media within a TV2 frame with 12 size M4 through �xing holes. The gasket should be speci�ed as shown in the gasket materials sections of the website & catalogue.

FREQUENCY FIELD TYPE VT (A) TYPE VT (B1) TYPE VT (B2)10KHz H 25 10 10100KHz H 45 25 181MHz H 58 35 361MHz E >100 93 >10010MHz E >100 95 >100100MHz E >100 97 >1001GHz P 73 54 4510GHz P 54 18 18Note VT(B1) media is woven aluminium 0.5mm @ 16 OPI (openings per inch)VT(B2) media is expanded Monel mesh 0.5mm @ 12 OPI

Performance: Typical Attenuation dB


VENTSHIELD | High Performance Vent/Filter Composites

VP Shielding

Applications: High performance steel, brass & stainless steel vents are designed for demanding applications such as screened rooms, military applications and shelters where high attenuation is required across the frequency range and particularly in the H-�eld. This range of ventilation panels is especially suitable for EMP and TEMPEST applications.

Specifications: Standard Cell Sizes (Opening x Depth)3.2 x 6.4mm 3.2 x 25.4mm 4.8 x 19.2mm3.2 x 12.7mm 4.8 x 6.4mm 4.8 x 25.4mm3.2 x 16mm 4.8 x 12.7mm 6.4 x 12.7mm3.2 x 19.2mm 4.8 x 16mm 6.4 x 25.4mm





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Our VP Shielding honeycomb ventilation panels can be custom manufactured from steel, brass or stainless steel. When selecting the material, corrosion resistance relevant to the application environment should be considered along with the attenuation requirements.

Typical construction styles are shown in figures A & B (other styles are available). Typical attenuation figures for the material types and thickness options are shown below. Both rectangular and circular styles are available. Various plating and gasket options are available and should be discussed at the time of ordering. The VP Shielding ventilation panels are manufactured to customer specification and a detailed drawing should be supplied.

How to order: Produced to customer drawings.


Fig A. Fig B.

TECHNOLOGY





VENTSHIELD | Thin Attenuation Vent Panels

VT Shielding

Applications: Thin vent panels are designed for enclosures or racks where RF attenuation and protection from the ingress of foreign bodies is required but space is at a premium.

Expanded aluminium mesh panels are nominally 6.0mm thick inside a 4.8mm thick frame and provide attenuation levels considerably higher than the woven aluminium & expanded Monel foil types which have a very small e�ect on air�ow but o�er less shielding e�ectiveness.

All three shielding materials have very di�erent properties and their air�ow characteristics are a function of size, positioning, application and air�ow source / volume. We suggest that a sample of the materials is requested for customer testing before speci�cations are �nalised - please ask our sales o�ce.Performance: Typical Attenuation dB




Our VT Shielding thin vent panels can be custom manufactured from expanded aluminium, woven aluminium or expanded Monel. When selecting the material, airflow should be considered along with the attenuation requirements.

VT thin vent panels are effectively slimmer versions of the VF air filters but with different filtration media. The VT Shielding comprises two basic types referred to as A & B.

VT(A) panels incorporate an expanded aluminium mesh which is crimped into an aluminium extrusion frame. The VT(A) style offers excellent dust filtration and RF shielding performance but considerably restricted airflow.

VT(B) vents incorporate either a woven aluminium or expanded Monel foil crimped into an aluminium extrusion.

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SERIES FRAME STYLE VENT MEDIA OVERALL SIZE FIXINGS (NO.) FIXING TYPEVT(A) TV1 or 05=Expanded Aluminium xxxx-xxxx xx xx TV2 06=Woven Aluminium VT(B) TV3 07=Expanded Monel



Example:VT(A)-TV2-05-2320-2320-12-T/H(M4) speci�es a thin vent utilising expanded and crimped aluminium alloy media within a TV2 frame with 12 size M4 through �xing holes. The gasket should be speci�ed as shown in the gasket materials sections of the website & catalogue.

FREQUENCY FIELD TYPE VT (A) TYPE VT (B1) TYPE VT (B2)10KHz H 25 10 10100KHz H 45 25 181MHz H 58 35 361MHz E >100 93 >10010MHz E >100 95 >100100MHz E >100 97 >1001GHz P 73 54 4510GHz P 54 18 18Note VT(B1) media is woven aluminium 0.5mm @ 16 OPI (openings per inch)VT(B2) media is expanded Monel mesh 0.5mm @ 12 OPI



VENTSHIELD | High Performance Vent/Filter Composites

VP Shielding

Applications: High performance steel, brass & stainless steel vents are designed for demanding applications such as screened rooms, military applications and shelters where high attenuation is required across the frequency range and particularly in the H-�eld. This range of ventilation panels is especially suitable for EMP and TEMPEST applications.

Specifications: Standard Cell Sizes (Opening x Depth)3.2 x 6.4mm 3.2 x 25.4mm 4.8 x 19.2mm3.2 x 12.7mm 4.8 x 6.4mm 4.8 x 25.4mm3.2 x 16mm 4.8 x 12.7mm 6.4 x 12.7mm3.2 x 19.2mm 4.8 x 16mm 6.4 x 25.4mm





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Our VP Shielding honeycomb ventilation panels can be custom manufactured from steel, brass or stainless steel. When selecting the material, corrosion resistance relevant to the application environment should be considered along with the attenuation requirements.

Typical construction styles are shown in figures A & B (other styles are available). Typical attenuation figures for the material types and thickness options are shown below. Both rectangular and circular styles are available. Various plating and gasket options are available and should be discussed at the time of ordering. The VP Shielding ventilation panels are manufactured to customer specification and a detailed drawing should be supplied.

How to order: Produced to customer drawings.


Fig A. Fig B.

TECHNOLOGY







VENTSHIELD | Attenuation Vents Our VH Shielding range of lightweight aluminium ... ·...

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